发明授权
US5002994A Phenolic moulding compositions 失效
酚醛成型组合物

Phenolic moulding compositions
摘要:
A phenolic moulding composition in solid form, such as a dough moulding composition or sheet moulding composition, comprises a phenol formaldehyde novolak resin; a phenol formaldehyde resole resin as cross linking agent for the novolak resin; fibrous reinforcement; and non-fibrous particulate filler in an amount greater than the combined amount of the novolak and resole resins; the weight proportions of the ingredients being in the ranges______________________________________ phenolic resins 20-40% fibrous reinforcement 20-50% non-fibrous particulate filler 25-50% ______________________________________ Articles moulded from the compositions under heat and pressure have the flexural strength and impact strength required in certain precision parts for the automotive and engineering industries.
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